Aerospace & Aviation

Reentry heating experiment to be flown by scout launch vehicle to test ablating materials for use in apollo project flight

Reactivity of titanium with oxygen

Torque-producing forces affecting satellite orientation - explorer satellite data

The mathematical and graphical description of the earth's main field has been, and is, a "data limited" problem. The World Magnetic Survey (WMS) is an endeavor to minimize this limitation by rapidly and comprehensively blanketing the earth with magnetic field measurements. Satellite surveys, which will play a key role in the W MS, are the principal topic of this paper. Existing magnetic field descriptions, the expected results from new surveys, and the methods of obtaining these results with the POGO satellite are emphasized. It is anticipated on the basis of extrapolation from Vanguard 3 results and other considerations that a factor of 10 improvement will be obtained. This means that the average errors of 1 to 3 percent now present in field charts and spherical harmonic descriptions should be reduced to 0.1 to 0.3 percent as a result of the survey.

Supersonic wind tunnel testing of antennas

Evaluation of adaptive control system for x-15 aircraft

Perturbation of alouette b satellite orbit

Algorithm for position and velocity coordinates of zonal harmonic perturbations of accurate reference orbit using vinti theory

Structure of strong collisionless wave in plasma perpendicular to magnetic field

Hydrazine and 1,1-dimethylhydrazine were radiolyzed at room temperature by using about 1 gram of liquid or 1/2 to 2 liters of vapor at room-temperature vapor pressure. A tungsten-target X-ray source operating at 300 kilovolts and 6 to 8 milliamperes (0.1 to 1.0 A) was used at intensities of 1 times 10 (sup 2) to 1 times 10 (sup 3) roentgens per minute to give total doses of 4.1 rads to 2.3 times 10 (sup 6) rads. The amounts of decomposition were dependent on total dose and independent of dose rate. In the case of hydrazine vapor, the decomposition was also directly related to surface area. There was a lesser surface effect with liquid hydrazine, but this variable was not studied for 1,1-dimethylhydrazine. The order of decreasing sensitivity to X-radiation is as follows: hydrazine vapor, 1,1-dimethylhydrazine vapor, 1,1-dimethylhydrazine liquid, and hydrazine liquid. The decomposition products of hydrazine were nitrogen, hydrogen, ammonia, and unidentified products. The same products plus methylamine, dimethylamine, and hydrazine were found from the decomposition of 1,1-dimethylhydrazine. In addition, the 1,1-dimethylhydrazine underwent post-irradiation changes. Values for G (number of molecules of sample decomposed per 100 electronvolts of absorbed energy) of the order of 10 (sup 6) suggest that the vapor-phase decompositions are chain reactions.

Stellar pulsation for rr lyrae and cepheid type variable stars

Bibliography on cosmic radiation

Meteorological and Geostrophysical Abstracts is a monthly publication devoted to current literature in meteorology, geophysics and astrophysics. Part I contains abstracts of current literature in the fields of meteorology, etc. Part II of each issue comprises of an annotated bibliography of important references on a special subject.

Medical aspects of space flight

Maneuverable landing system for mars landing